Warriors centre Konrad Hurrell was served with his third "concerning act' notice by the NRL match review committee. Photo/Getty

Warriors centre Konrad Hurrell knows he risks a lengthy suspension if he is involved in another kneeing incident and has vowed to work further on his controversial running style.

Hurrell was fortunate to escape sanction following a charging run left Manly captain Jake Trbojevic concussed, after his head connected with the ball-carrier's knee in an awkward attempted tackle during Saturday's second round pool match at the NRL Auckland Nines.

Hurrell was visibly concerned as the 21-year-old prop was tended to by medical staff before being carted from Eden Park, with Trbojevic later ruled out of the remainder of the tournament.

It follows a similar incident from last season when Hurrell was suspended for three matches and ordered to correct his running style after his raised knee left Cronulla defender Anthony Tupou with a broken jaw.

The 24-year-old avoided an appearance in front of the NRL judiciary but was served with his third "concerning act' notice by the match review committee.

"At the time I just felt sorry for (Trbojevic). It was just my running, I was trying to run hard," Hurrell said.